BUSHING INSULATOR AND PROCEDURE FOR ITS FABRICATION Russian patent published in 2010 - IPC H01B17/26 

FIELD: metallurgy.

SUBSTANCE: bushing insulator has channel (6) wherein there is installed current conducting pin enveloped with graded insulation (5) preventing from effect of electric field. The bushing insulator contains rod (1) with cylinder case (2). The cylinder case encloses graded insulation (5) and flange (3) arranged around above said case (2) and functioning as carrier of through orifices (8) located along its circumference and designed for bushing insulator attachment to wall (4) by means of bolts (12). Case (2) and flange (3) are a single unit and consist of insulating binding material, for example plastic mixed with non-organic filler. Through orifices (8) are surrounded mainly with circular metal insertions (9). Additionally, circular shaped surface of each insertion is flushed relative to surface of flange (3) contacting head of bolt (12) and bears load exerted with the bolt onto flange (3). Diagnosis branch (13) contains contact pin (14) electrically coupled with layer of graded insulation (5) the most remote from centre and surrounded with contact ring (15). This contact ring is tied with each second metal insertion (9) by means of connecting wires (17) to ground contact pin (14) via contact ring (15), when diagnosis branch (13) is not actuated and closed with a metal cap. Procedure for fabrication of the bushing insulator consists in arranging components of graded insulation, in diagnosis contact between at least one metal insertion and at least one connecting element in a cast mould, and in filling it with liquid insulating binding material. Upon solidification the bushing insulator is extracted from the cast mould.

EFFECT: improving procedure.

15 cl, 4 dwg